WO2019019886A1 - Measurement and control system for generator rotor pumping - Google Patents

Abstract

A generator rotor pull-through measurement and control system comprises a distance measuring probe (100), a tilting angle sensor (500), a control module (200) and a display screen (300), and the distance measuring probe (100) is used for measuring the rotor (20) and The gap between the stators (30). The distance measuring probe (100) is provided with a plurality of parts, and the partial distance measuring probes (100) are arranged on the side wall of the rotor (20) at intervals, and close to the first end (22), and the partial distance measuring probes (100) are arranged at intervals. On the inner wall of the stator (30), and close to the excitation end (14). The control module (200) is coupled to the ranging probe (100) and is capable of receiving the first information transmitted by the ranging probe (100). The first information is a gap between the rotor (20) and the stator (30), and the control module ( 200) is also coupled to the tilt sensor (500) and is capable of receiving second information transmitted by the tilt sensor (500), the second information being the level of the slider (40).

Description

Generator rotor pull-through measurement and control system

This application claims to be filed on July 28, 2017, the Chinese Patent Office, the application number is CN201710633489.X, the title of the invention is the priority of the Chinese patent application of the "generator rotor pull-through measurement and control system", the entire contents of which are incorporated herein by reference. In the application.

Technical field

The invention relates to the technical field of generators, in particular to a generator rotor draw-through measurement and control system.

Background technique

Large horizontal generators are often used in nuclear power engineering, and workers need to periodically pull through the rotor to check the rotor's condition. When the rotor is drawn through, the two ends of the rotor are first lifted by two slings, and a slide for carrying the rotor is placed in the stator. Usually, during the process of lifting the rotor from the sling, multiple workers are provided at the steam end and the excitation end of the generator to monitor the gap between the rotor and the stator to avoid collision between the rotor and the stator and damage the generator. The rotor of such a large horizontal generator is more than ten meters long. In the process of pumping through the rotor, the minimum gap between the rotor and the stator is only about 50 mm. Therefore, when lifting the rotor, the staff needs to be highly concentrated. However, human observation is very error-prone, which reduces the safety of the rotor.

Summary of the invention

According to various embodiments of the present application, a generator rotor pull-through monitoring system capable of improving safety is provided.

A generator rotor pull-through measurement and control system for monitoring the position of a generator rotor relative to a stator, including:

The distance measuring probe is provided with a plurality of the distance measuring probes arranged on the side wall of the rotor at intervals, and adjacent to the first end of the rotor, part of the ranging probes are arranged at intervals in the stator On the inner wall, and close to the excitation end of the generator, each of the distance measuring probes is used to obtain a gap between the rotor and an area of the stator;

a tilt sensor disposed in the slider located in the stator and carried in the rotor, wherein the tilt sensor is used to measure the levelness of the skateboard;

a control module, connected to the ranging probe, and capable of receiving first information sent by the ranging probe, the first information is a gap between the rotor and the stator, and the control module is further The tilt sensor is coupled and is capable of receiving second information transmitted by the tilt sensor, the second information being a level of the skateboard;

And a display screen connected to the control module, wherein the display screen can display the first information and the second information.

Details of one or more embodiments of the invention are set forth in the accompanying drawings and description below. Other features, objects, and advantages of the invention will be apparent from the description and appended claims.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a diagram showing an application state of a generator rotor pull-through measurement and control system on a generator according to an embodiment;

2 is another application state diagram of the generator rotor pull-through measurement and control system shown in FIG. 1 on the generator;

3 is a block diagram of a module of the generator rotor pull-through measurement and control system shown in FIG. 1;

4 is a schematic view of the distance measuring probe and the fan seat in the generator rotor pull-through measurement and control system shown in FIG. 1;

Figure 5 is a cross-sectional view of the slider of Figure 1.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are given in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be more fully understood.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. The terms "inner", "outside", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment.

The viewing angle is shown in Fig. 1. The left end of the generator is the steam end 12, the right end of the generator is the excitation end 14, the left end of the rotor 20 is the first end 22, and the right end of the rotor 20 is the second end 24. When the rotor 20 is withdrawn, it is mainly divided into three phases: a preparation phase, an intermediate phase, and a later phase. Wherein, in the preparation stage, the first end 22 and the second end 24 of the rotor 20 are respectively lifted by two slings, and the slide plate 40 is placed from the excitation end 14 into the gap between the rotor 20 and the stator 30, and The slider 40 is pushed into one end of the stator 30 near the vapor end 12. After the rotor 20 is lowered, the rotor 20 is supported on the slider 40. At this time, the sling at the first end 22 is removed, then the left end of the rotor 20 is supported by the sled 40 and the right end is still supported by the sling. Intermediate stage: The rotor 20 is pulled by a hoist such that the rotor 20 moves slowly in the direction of the steam end 12 to the end 14 and the slide 40 moves with the rotor 20 as the rotor 20 moves.

At the same time, in conjunction with FIG. 2, the later stage: when the length of the rotor 20 is extracted is greater than or equal to half of the total length of the rotor 20, the hoist is removed, and a stake 50 is disposed at the excitation end 14 so that the left half of the rotor 20 is supported on the slider 40. The right half is supported on the stake 50. At this time, the sling at the second end 24 is removed, and the double sling 60 is used to hang the intermediate portion of the rotor 20, so that the center of the double sling 60 coincides with the center of gravity of the rotor 20 as much as possible. The rotor 20 is hoisted so that the rotor 20 is disengaged from the sled 30 and the stud 50, and the rotor 20 is completely withdrawn from the stator 30 in cooperation with the crane and the crew. The method of threading the rotor 20 into the stator 30 is similar, and will not be described again here.

In the preparation phase and in the later phase, the operation of lifting the rotor occurs. The rotor of such a large horizontal generator is more than ten meters long, the gap between the rotor and the stator is only 96 mm, and the rotor retaining ring 26 is 43.5 mm larger than the outer diameter of the rotor, so that after the guard ring 26 enters the stator 30, the stator 30 and The gap between the grommet 26 is only 52.5 mm. The gap is small so that the rotor 20 easily collides with the stator 30 when the rotor 20 is lifted. To improve the safety of the pumping rotor 20, as shown in FIGS. 1-3, the present embodiment provides a generator rotor pull-through measurement and control system 70 for monitoring the position of the rotor 20 relative to the stator 30 in real time.

Specifically, the generator rotor pull-through measurement and control system 70 includes a distance measuring probe 100, a control module 200, and a display screen 300, wherein the distance measuring probe 100 is used to measure a gap between the rotor 20 and the stator 30. The ranging probes 100 are provided in plurality, and the partial ranging probes 100 are arranged on the sidewalls of the rotor 20 at intervals, and are close to the first end 22, and some of the ranging probes 100 are arranged on the inner wall of the stator 30 at intervals, and are close to the excitation. End 14. The control module 200 is coupled to the ranging probe 100 and is capable of receiving first information transmitted by the ranging probe 100. The first information is a gap between the rotor 20 and the stator 30. The display screen 300 is connected to the control module 200 and can display the first information. In the present embodiment, the distance measuring probe 100 is a magnetic laser ranging sensor with a measuring range of about 50 mm and an accuracy of 1 mm. In other embodiments, the ranging probe 100 may also be an ultrasonic ranging sensor or an infrared ranging sensor.

When the rotor 20 is drawn through, the distance measuring probe 100 can measure the gap between the rotor 20 and the stator 30 in real time, and sends the measured data to the control module 200, and the staff can know the data through the display 300 in time. And accurately adjusting the position of the rotor 20 with respect to the stator 30 to prevent the rotor 20 from colliding with the stator 30. Compared with the observation by the human eye, the data measured by the distance measuring probe 100 is more accurate, which can effectively reduce the command error caused by the manual observation and improve the engineering safety. It is also possible to save the labor of the special monitoring of the gap size at the steam end 12 and the excitation end 14 when the conventional rotor is pulled through the rotor 20, thereby saving labor costs.

The generator rotor pull-through measurement and control system 70 further includes a camera 400 connected to the control module 200. The camera 400 is used to capture a gap image between the rotor 20 and the stator 30, and can send the photographing screen to the control module 200 for display on the display screen. 300, so that staff can check the gaps at various locations at any time. The camera 400 includes a light source for illuminating the shooting area of the camera 400 to make the screen displayed by the display screen 300 clearer. The camera 400 is provided in plurality and corresponds to the ranging probe 100 one by one, that is, the number of the cameras 400 is equal to the number of the ranging probes 100, and one camera 400 is necessarily provided beside a ranging probe 100.

In the present embodiment, the rotor 20 is provided with a fan holder 28 which is adjacent to the first end 22. The stator 30 is provided with a windshield 32, and the windshield 32 is adjacent to the excitation end 14. The partial distance measuring probes 100 are arranged on the fan base 28 at intervals. The partial distance measuring probes 100 are arranged on the windshield ring 32. When the distance measuring probe 100 is connected to the windshield ring 32, the extension rod 34 is required to make the distance measurement. The probe 100 is flush with the inner wall of the stator 30. Accordingly, the camera 400 is also disposed on the fan holder 28 and the windshield 32, respectively. As can be seen from FIG. 1, the diameter of the fan holder 28 is smaller than the diameter of the guard ring 26, larger than the diameter of the first end 22, and the distance measuring probe 100 and the camera 400 are mounted on the fan holder 28, neither of which is drawn through the rotor. At 20 o'clock, the ranging probe 100 and the camera 400 are damaged, and a better shooting point can be provided, so that the camera 400 is not blocked. Similarly, considering the safety of the ranging probe 100 and the viewing angle of the camera 400, the windshield 32 is also an optimal mounting position.

Further, as shown in FIG. 1 and FIG. 4, in the present embodiment, the distance measuring probe 100 is provided with eight, wherein four ranging probes 100 are arranged on the fan base 28 at intervals, and the other four ranging probes 100 are spaced apart. Arranged on the windshield 32.

Moreover, on the fan holder 28, four ranging probes 100 are disposed opposite each other, and two of the distance measuring probes 100 are located in the vertical direction, and the other two ranging probes 100 are located in the horizontal direction.

On the windshield 32, four ranging probes 100 are disposed opposite each other, and two of the ranging probes 100 are located in the vertical direction, and the other two ranging probes 100 are located in the horizontal direction.

Taking the fan base 28 as an example, it is assumed that the four ranging probes 100 on the fan base 28 are the first ranging probe 100a, the second ranging probe 100b, the third ranging probe 100c, and the fourth ranging probe 100d, respectively. The direction from the vapor end 12 to the excitation end 14 is the viewing angle. As can be seen from FIG. 4, the side view of the fan holder 28 is circular, the first distance measuring probe 100a is located at the highest point of the circle, and the second distance measuring probe 100b is located at the lowest point of the circle, the third ranging probe 100c is located at the leftmost point of the circle, and the fourth ranging probe 100d is located at the rightmost point of the circle. When the gap value measured by the first ranging probe 100a is too small, the worker needs to adjust the first end 22 of the rotor 20 downward. When the gap value measured by the second ranging probe 100b is too small, the worker needs to adjust the first end 22 of the rotor 20 upward. When the gap value measured by the third ranging probe 100c is too small, the worker needs to adjust the first end 22 of the rotor 20 to the right. When the gap value measured by the fourth ranging probe 100d is small, the worker needs to adjust the first end 22 of the rotor 20 to the left. For the staff, the four directions of up, down, left and right are the most intuitive. When adjusting the position of the rotor 20, the adjustment along these four directions is also the most convenient.

The display screen 300 can display the gap corresponding to the first ranging probe 100a, the second ranging probe 100b, the third ranging probe 100c, and the fourth ranging probe 100d in real time, and also enlarges the video of the position where the gap value is the smallest. Display to highlight key points and alert staff.

The working principle of the four ranging probes 100 on the windshield 32 is the same as that of the four ranging probes 100 on the fan base 28, and will not be described again here.

As shown in FIG. 1, FIG. 3 and FIG. 5, one side of the slider 40 near the stator 30 is a curved surface, and after the slider 40 is placed in the stator 30, the curved surface can completely conform to the inner wall of the stator 30. The slider 40 serves as the sole support for carrying the weight of the left half of the rotor 20. The level of the slider 40 is directly related to whether it can bear the weight well. In order to detect the levelness of the slider 40, the generator rotor pull-through measurement and control system 70 of the present embodiment also provides a tilt sensor 500 on the slider 40. Specifically, a side of the sliding plate 40 adjacent to the stator 30 is provided with a groove 42 , and the inclination sensor 500 is received in the groove 42 . The tilt sensor 500 is used to measure the levelness of the slider 40. The tilt sensor 500 is coupled to the control module 200 and can transmit second information to the control module 200. The second information is the level of the slider 40. The display screen 300 can display the second information to facilitate the adjustment of the position of the skateboard 40 by the worker.

The tilt sensor 500 can monitor the level of the slider 40 in real time to ensure that the slider 40 can always be in the desired load bearing position during pumping through the rotor 20, improving the safety of the pumping rotor 20.

The slider 40 equipped with the tilt sensor 500 has a symmetrical structure, i.e., the line of symmetry of the recess 42 coincides with the line of symmetry of the slider 42. When the tilt sensor 500 measures data to be 0, it means that the slider 40 is in the most desirable position. In the present embodiment, the direction from the vapor end 12 to the excitation end 14 is still the viewing angle, and the most desirable position is the position at which the lowest point of the slider 40 coincides with the lowest point of the inner wall of the stator 30.

As shown in FIG. 2, when the length of the rotor 20 is greater than or equal to half of the total length of the rotor 20, since the length of the rotor 20 exposed outside the stator 30 is long, the data measured by the distance measuring probe 100 on the windshield 32 is only It can represent the distance from the intermediate portion of the rotor 20 to the distance measuring probe 100, and cannot reflect the amplitude of the actual shaking of the second end 24, so that when the rotor 20 is withdrawn, the first end 22 may collide with the stator 30 due to the instability of the center of gravity. To further improve the safety of the pumping, the generator rotor pull-through monitoring system 70 is provided with a level sensor 600 on the rotor 20. A level sensor 600 is provided on the side wall of the rotor 20 and is used to measure the levelness of the rotor 20. The level sensor 600 is coupled to the control module 200 and is capable of transmitting third information to the control module 200, the third information being the level of the rotor 20, and the display screen 300 being capable of displaying the third information.

In the present embodiment, the level sensor 600 is provided with two, one of which is adjacent to the first end 22 and the other of which is adjacent to the second end 24. The two level sensors 600 are capable of reflecting the difference in height between the first end 22 and the second end 24 of the rotor 20. The worker needs to adjust the position of the double sling 60 relative to the rotor 20 based on the results measured by the level sensor 600. For example, when the first end 22 is high, the double sling 60 needs to be moved to the left relative to the rotor, and when the second end 24 is high, the double sling 60 needs to be moved to the right relative to the rotor. Only when the center of the double sling 60 is as close as possible to the center of gravity of the rotor 20, the rotor 20 can reduce the sway amplitude as much as possible.

As shown in FIG. 3, the generator rotor pull-through measurement and control system 70 further includes a calculation module 700. The calculation module 700 is connected to the control module 200, and can calculate a correction value according to the first information and the third information. Specifically, the calculation module 700 can provide an adjustment suggestion according to the measurement result of each ranging probe 100, and the adjustment suggestions include adjusting the direction and adjusting the value. The calculation module 700 is further capable of calculating the adjustment direction and the adjustment value of the double sling 60 by a preset algorithm according to the measurement result of the level sensor 600. This method of correcting the position of the rotor 20 is fast, error-free, and highly secure.

In this embodiment, the control module 200, the display screen 300, and the computing module 700 are integrated on a mobile terminal, and the mobile terminal may be a mobile phone, a tablet, a computer, or the like. When the data deviation measured by the ranging probe 100, the tilt sensor 500, and the level sensor 600 is large, the mobile terminal may also set an alarm mode to alert the worker.

As shown in FIG. 1, the generator rotor pull-through measurement and control system 70 further includes a bird's eye view camera 800. The overhead view camera 800 is provided with two, one of which is used for photographing the working area of the steam terminal 12, and the other is overlooking. The camera 800 is used to capture the working area of the excitation end 14. The two overhead cameras 800 are connected to the control module 200, and can send the shooting pictures to the control module 200 for display on the display screen 300, so that the commanding staff can simultaneously understand the working conditions of the steam terminal 12 and the excitation end 14, Avoid frequent intercom communication and back and forth viewing, convenient command and save time.

The technical features of the above-described embodiments may be combined in any combination. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims (10)

A generator rotor pull-through measurement and control system for monitoring a position of a rotor of a generator relative to a stator, comprising: The distance measuring probe is provided with a plurality of the distance measuring probes arranged on the side wall of the rotor at intervals, and adjacent to the first end of the rotor, part of the ranging probes are arranged at intervals in the stator On the inner wall, and close to the excitation end of the generator, each of the distance measuring probes is used to obtain a gap between the rotor and an area of the stator; a tilt sensor disposed in the slider located in the stator and carried in the rotor, wherein the tilt sensor is used to measure the levelness of the skateboard; a control module, connected to the ranging probe, and capable of receiving first information sent by the ranging probe, the first information is a gap between the rotor and the stator, and the control module is further The tilt sensor is coupled and is capable of receiving second information transmitted by the tilt sensor, the second information being a level of the skateboard; And a display screen connected to the control module, wherein the display screen can display the first information and the second information. The generator rotor pull-through measurement and control system according to claim 1, further comprising a camera connected to the control module, wherein the camera is provided in plurality and corresponds to the ranging probe in one-to-one correspondence. The camera can send a shooting picture to the control module for display on the display screen, the camera includes a light source for illuminating a shooting area of the camera. The generator rotor pull-through measurement and control system according to claim 2, wherein the distance measuring probe near the first end is disposed on a fan seat of the rotor, and the distance measurement is close to the excitation end. The probe is disposed on the windshield of the stator. The generator rotor pull-through measurement and control system according to claim 3, wherein the distance measuring probe is provided with eight, wherein the four ranging probes are arranged on the fan seat at intervals, and the other four The ranging probes are spaced apart on the windshield. The generator rotor pull-through measurement and control system according to claim 4, wherein on the fan base, four of the distance measuring probes are disposed opposite each other, and two of the distance measuring probes are located vertically In the direction, the other two of the distance measuring probes are located in the horizontal direction; On the windshield, four of the distance measuring probes are disposed opposite each other, and two of the distance measuring probes are located in a vertical direction, and the other two of the distance measuring probes are located in a horizontal direction. The generator rotor pull-through measurement and control system according to claim 1, wherein the tilt sensor is received in a groove of the sliding plate, and the tilt sensor and the sliding plate together form a symmetrical structure. The generator rotor pull-through measurement and control system according to claim 1, further comprising a level sensor disposed on a sidewall of the rotor and configured to measure a level of the rotor, The level sensor is coupled to the control module and is capable of transmitting third information to the control module to cause the third information to be displayed on the display screen, the third information being a level of the rotor. The generator rotor pull-through measurement and control system according to claim 7, wherein said level sensor is provided with two, wherein said one level sensor is adjacent to said first end, and the other said horizontal sensor is adjacent to said The second end of the rotor. The generator rotor pull-through measurement and control system according to claim 7, wherein the generator rotor pull-through measurement and control system further comprises a calculation module, wherein the calculation module is connected to the control module and the display screen, The calculation module can calculate a correction value according to the first information and the third information, and the display screen can display the correction value. The generator rotor pull-through measurement and control system according to claim 1, further comprising a bird's-eye view camera, wherein the overhead view camera is provided with two, one of the overhead view cameras for photographing the generator a working area of the steam end, another of the overhead type cameras is used to capture the working area of the excitation end, two of the overhead type cameras are connected to the control module, and can send the shooting picture to the control module to display On the display.

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